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Neutral beam heated H-mode DIII-D and JET expanded boundary divertor discharges are examined, to study the parametric dependence of thermal energy confinement on plasma current, plasma size and neutral beam power. The single-null discharges in both machines are examined during the ELM-free phase in order to extract information about the intrinsic H-mode thermal energy confinement. A power law dependence of ELM-free thermal energy confinement is assumed. The size dependence of t(th) is described by the linear dimension L, since the determination of the individual a and R dependencies is precluded by the similar aspect ratio of the two machines. For this representation of t(th) with units of MA, MW and metres, when L is the plasma major radius C=0.106+/-0.011 and when L is the plasma minor radius C=0.441+/-0.044. A dimensionally correct version of the scaling, consistent with the constraints of a collisional high beta model, gives values within error bars of all coefficients with respect to the previously mentioned empirical scaling.

Additional information

Authors: TUBBING B J D, JET Joint Undertaking, Abingdon, Oxon. (GB);THOMSEN K ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB);SCHISSEL D P, General Atomics, San Diego (US);THE DIII-D RESEARCH TEAM ET AL.., General Atomics, San Diego (US)
Bibliographic Reference: Report: JET-P(90)16 EN (1990) 31 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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